if i wanted to sum up Final Fantasy X's story i could make a half decent attempt at it. i wouldn't really know where to begin to sum up VII's story.So FF 7 is a convoluted mess but FF 10 is a-okay?
i'll try it right now. Final Fantasy VII: Sephiroth was an experiment alien / human baby created from alien life that crashed on the planet. he found out and went insane and he wants to destroy the world by crashing a meteorite into it so it will attempt to heal itself and then he can capture that energy and use it to surf through the universe destroying other worlds.
Final Fantasy X: two kingdoms were at war and one lost and in order to preserve his kingdom Yu Yevon turned it into a magical summon in which it existed inside Sin a creature designed to keep the outside world at a technological standstill and preserve his immortal kingdom. the people he used to create said kingdom grew tired and wanted to rest in peace so they allowed a resident of the kingdom to escape it and used him to bring an end to the kingdom itself so they could rest.
both are crazy but the plot of X resembles something understandable. even the villain's ambitions in VII are pointless.